Questions tagged [disease-transmission]

Questions regarding how diseases are transmitted, whether between people or from the environment (including animals) to people.

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Definition of 'transmission onset' in this paper

I am a nonmedical scientist trying to make sense of medical terms that were involved in the following study: Transmission onset distribution of COVID-19. I am attaching a link to the paper for your ...
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Oral hygeine and transmission of SARS-COV-2

So after lunch I and others around me are used to brush their teeth, also when being at work. However, in these times I am getting more and more worried that using public sinks for reasons other than ...
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Why do we seemingly not know how COVID will behave during winter, when it was winter in much of the world?

(Not sure if this is the right SE for this question) Why COVID Outbreaks Could Worsen This Winter Baker has tried to tease apart the effect of climate on the seasonal pattern of cases during the ...
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Are there already statistics about the spread of common viral diseases in the Covid-19 pandemic era?

Are there already public statistics regarding the spread of other viral diseases since the beginning of the Covid-19 pandemic, and the application of mandatory protection rules (e.g. protection masks, ...
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Why does R_t start so high for COVID in these models?

The site rt.live is a website for tracking the Rt value for COVID-19 for states in the U.S. The Rt value is the average number of people infected by someone who is infected with COVID-19. In almost ...
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Could I infect someone else with a disease if I have already received a vaccine for said disease?

I was recently having a conversation with someone I am very close to in which there was some confusion on how a disease (specially a virus) could be passed from person A to person B, even if person A ...
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how to test the effectiveness of a mask concept, that creates artificial distance

Distance is seen as a very good precaution against COVID-19. If we all could breath in at a hight of say 2 meters and breath out a a hight of 50 cm, then we could stand right next to each other and ...
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Is there data on the effectiveness of masks for preventing COVID-19 transmission in outdoor settings?

In the COVID-19 pandemic, many jurisdictions are now requiring that masks be worn in public, often including both indoor and outdoor settings. However, many sources (including widely cited preprints ...
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What are some medical conditions and disabilities that might prevent someone from wearing a face covering during the COVID-19 outbreak?

In Oregon, my local news station said that many local businesses, such as airports, are requiring that everyone wear masks or face coverings to slow the spread of COVID-19. They said that those who ...
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Is there a standard projection (or ensemble of proyections) about whether a second wave of COVID-19 will occur?

Several countries and states are leaving or have partially left the lockdown and, with constraints, are recovering economical activity after getting hit by the covid-19 crisis. WHO has warned that ...
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Social Distancing Groups at Beaches and similar large venues [closed]

Government agencies (for this conversation, assume USA) have provided guidance to prevent COVID-19 transmission. As it is a holiday, many lockdown weary have flocked to the beaches and similar venues....
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Are (transparent) face shields without masks/respirators reasonably effective at preventing respiratory illness transmission?

You can see "splash guards" used by (almost) everyone in this video of a German tracing center, but (almost) nobody wears masks there. (Well, one spokesperson did wear mask and no shield.) So are ...
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Is there a possibility of transmission of COVID-19 during sample collection process?

Is there a possibility of transmission of COVID-19 during sample collection process from safety kits worn by sample collecting person to the suspected infected person whose sample is being collected? ...
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Examples of infected disinfectants?

I've read in Pommerville's (2016) Fundamentals of Microbiology (p. 314) that contrary to popular belief that disinfectants kill all germs, there are examples of disinfectants that were contaminated ...
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Testing vs transmissibility of COVID-19 [closed]

For a person infected with COVID-19, what generally is the period of time where: they are capable of infecting others? they will test postive for the disease? In particular, I'm curious if a window ...
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What information we have about transmission of COVID-19 in detail?

A lot of information we have how the COVID-19 virus spreads in general. But what do we know about the detected and proven way of transmission: about which items (door handles, plates, salad bar, ...) ...
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Why won't COVID-19 just start spreading again once quarantine is re-opened?

COVID-19 pandemic started because 1 person had the virus, and then it spread to a lot of others. Now, let's say your country imposed quarantine and distancing, and you managed to halt the growth of ...
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Do common colds transmit poorly through mouth-to-mouth kisses?

The Guardian (in 2017) chose to highlight this study In 1984, researchers at the University of Wisconsin-Madison decided to investigate one of the best-known ways of catching a cold. They infected ...
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Are there viruses which can spread from humans to animals, but cannot spread from animals to humans? [closed]

It had already been proven that felines can be infected with COVID-19 from exposure to infected humans. However authorities are currently saying that there isn't evidence of the opposite happening - ...
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What is the distance the COVID-19 virus can travel in the air out of doors and remain infectious for someone breathing the same air?

I edited my question after doing some research. I also edited the question to include phrase "out of door". When indoors the risk is increased considerable with stale air or air that has ...
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How is COVID-19 transmission tracked with any accuracy?

I saw this article: New study finds few cases of outdoor transmission of coronavirus in China (and study it is based on). I don't have a science or medical background so maybe this is obvious but how ...
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Will everyone get the COVID-19?

There is a Ben Shapiro tweet that says: For a variety of reasons, many Americans seem to think that "flattening the curve" means that fewer Americans will get covid-19 total. This is inaccurate....
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Is outside food really safe to eat during COVID-19 outbreak?

There are 2 contradicting messages out there that mandate this question: "It may be possible that a person can get COVID-19 by touching a surface or object that has the virus on it and then touching ...
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Was the Huanan wet market a super spreader event instead of ground zero for COVID-19?

There have been a number of well recognised super spreader events such as Patient 31 in South Korea where a member of the church called Shincheonji was thought to have spread the disease to 30-40 ...
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Can you recover from COVID-19, and then be reinfected so as to be a danger to other people?

Assuming I've contracted COVID-19 this January and made a full recovery and the antibodies have already left my body again. Now, I come into contact with someone who is sick and I inhale some COVID-19 ...
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Is there a virus from which humans can recover, but which doesn't grant long lasting immunity?

Prior to the SARS-CoV-2 epidemic I was under the impression that viruses fall into two categories: Diseases from which you recover and afterwards become fully immune. When reinfected with a mutated ...
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Transmission of COVID-19 through domesticated animals

This is an exploratory question. If a COVID-19 infected person (person is unaware that he is infected) milks the cow for couple of days, is there a possibility of him infecting the cow thereby ...
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Should I wear mask to supermarket to protect myself from coronavirus? [duplicate]

US news keeps telling average people NO NEED to wear masks for coronavirus, but I see on TV that when Chinese/Korean/Japnese go out to the street, all of them wear masks. If the US advise people to ...
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How coronavirus are transmitted in New York City and in other states in the US? [duplicate]

We know coronavirus is transmitted by 1) droplet in air 2) touching a physically contaminated object by a coronavirus patient and then touch our face or mouth. Now New York City got hit so hard, ...
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What is known about transmission of coronaviruses through food?

I've seen a lot data about COVID-19 virus (SARS-CoV-2) on dry surfaces. But what about wet mediums, in particular food? In the West, it's easy enough to disinfect supermarket packages (before opening ...
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What's the evidence for “flattening the curve” by social distancing measures in the context of contagious respiratory diseases?

This is more of Skeptics-style question, but since I only know of people on Stack Exchange challenging this (so it would not be a "notable claim" for Skeptics)... I'm asking here. For ...
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Is there an inflection point in Coronavirus outbreaks where you can't contain the epidemy anymore?

So far only a few countries have been able to reduce through policies the number of people infected in their countries after being exposed to thousands of infected, viz. China (including Taiwan, Hong ...
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How can I convert mutation rates into number of infected people?

Yes, the question sound strange. But the fact is that mutation rate, μ, is of often measured in terms of substitutions per nucleotide per cell infection, written as "(s/n/c)". So if I have a ...
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How is the NHS trying to delay the peak of covid-19? [closed]

On march the 16th (probably) the NHS held a press conference (Youtube Link) that includes (paraphrased) We need to <u><b>delay and weaken</b></u> the peak so the NHS would ...
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Confusing COVID article - Why would keeping the doubling time above the incubation period flatten the curve?

I stumbled upon this boiled down news article which makes the statement that if we get the doubling time for coronavirus cases above the incubation period (5.8 days), we will be able to effectively "...
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Can bedbugs transmit the COVID-19 virus from person to person? [closed]

I am in Montreal now and unable to leave because if I go home they will sent me in quarantine in various places where I do not want to go. Question: Do bedbugs transmit COVID-19 from person to person?...
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Why aren't we sterilizing N95 masks?

Please forgive the obvious question. H2O2 vapor sterilization is deadly for the layperson but should be workable for hospitals. I can't find the small Chinese study I read the other day about it. ...
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What fraction health care workers contract COVID-19?

What fraction of health care workers contract COVID-19? Does anyone know of empirical evidence? Ideally, I’m looking for a reference to a study involving type of work, e.g., ER in close contact vs. ...
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Given “enough time”, does the coronavirus in a person just die off / get killed by white blood cells, leading to a full recovery?

During this social distancing that we're implementing, what happens to someone who, for example, is asymptomatic (i.e. has no symptoms) but is infected? Given "enough time", say, 2 weeks, does the ...
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Is a nightly curfew an effective intervention strategy for limiting the spread of an infectious disease?

The governing bodies of several geographic areas hit by disease outbreaks will sometimes impose a nightly curfew on their citizens, restricting or limiting the ability of their citizens from going ...
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As epidemiological countermeasures, why are flights cancelled and surface transport is not?

An early measure to avoid the spread of COVID-19 has been the cancellations of flights from infected zones, e.g.: https://www.reuters.com/article/health-coronavirus-spain-flights/corrected-spain-...
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Why has the African region not seen many Covid-19 cases so far?

According to the World Health Organization's situation report for March 12th, the African region has only recorded 51 cases of the Covid-19 virus, and only one of these cases has been fatal. The ...
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Is the washing hands in order to protect yourself from COVID-19 backed up by research?

I have been hearing a lot of people say that it is recommended to wash your hands thoroughly in order to maximise protection against COVID-19 infection. I also heard that the washing hands rumours are ...
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What would have happened had Covid-19 not been treated as something special? [closed]

If the world hadn't noticed that Covid-19 was significantly different from previous situations, and if it had treated it like any other flu outbreak, what would have happened? Typically an influenza ...
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Contraction-to-contagion duration for covid-19?

I've read that the incubation period of the covid-19 virus ranges from 2 to 14 days with rare exceptions (e.g. here). However, a person carrying a virus could theoretically be contagious and transmit ...
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Can COVID-19 be transferred through food handled by infected individuals? [closed]

Do COVID-19 spread by consuming foods that have been handled by infected individuals? My question is related to foods such as bread that we can't really clean up before eating being handled by ...
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Will 70% isopropyl alcohol deactivate i.e. kill COVID-19?

Today the CDC released an official list of what kills the COVID-19 virus but the list does not mention 70% isopropyl alcohol. This is a fairly basic disinfectant and it seems it should have been on ...
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Why getting off the transport where person has coughed is not going to help?

There is such piece of the dialog between journalist and the doctor (in the middle of an interview about Coronavirus): -If somebody's coughing on the bus should you get off? -No, getting off isn't ...
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Looking for references describing the physical transmission of rhinoviruses and coronaviruses

I'm looking for reputable reference works that describe the physical aspects of how particles containing rhinoviruses and coronaviruses travel through the environment during disease transmission. I'm ...
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The likelihood of contracting a disease from flies?

Given a housefly has landed on your food, and that you then consume it, what is the likelihood of contracting some malady directly attributable to the fly? I'm aware that flies can carry diseases ...